What's your "turn the brain off role"...and why is it DPS?

I've been playing overwatch for awhile, and I have a lot of fun playing all of the roles. I've gone through different stages focusing on each role and usually rotate through them all day by day. One thing I've noticed though is if I want to turn my brain off, or maybe I've had too much to drink, or I'm just exhausted and can't fully focus I go right to DPS. I feel like if I jump into support or tank not fully prepared I basically screw the team, yet I can be a few too many beers deep, or basically half passed out running on no sleep and easily play well as a DPS. So for you...what is your "brain dead" role, and why is it DPS?